You’ve booked a caterer, picked a headcount, and now you’re staring at the menu builder wondering how many vegetarian or vegan plates to add. Nobody RSVP’d with their dietary preferences, and guessing wrong in either direction is expensive — order too few plant-based dishes and some guests go hungry or improvise with a side salad; order too many and you’re paying for trays that come back untouched. There’s a real, workable rule of thumb for this, and it’s more nuanced than just “add a few extra.”
Why "A Few Extra Plates" Isn’t a Real Plan
The instinct on a lot of event menus is to treat vegetarian or vegan needs as an afterthought — a handful of substitutions bolted onto a meat-centric plan. That approach breaks down for two reasons. First, the share of guests who want a plant-based option is usually larger than hosts assume, because it includes not just strict vegetarians and vegans but "flexitarians" and guests who are simply cutting back on meat. Second, when the vegetarian option is just the same dish with the protein pulled out, it tends to be the least appealing thing on the buffet — which pushes even committed plant-based eaters to pick at bread and salad instead of getting a real meal.
The Percentage Guideline Caterers Actually Use
When a host has no RSVP data at all, the standard starting point in event catering is to plan for roughly 20 to 25 percent of guests wanting a plant-based dish. That’s the baseline for a general mixed audience — a wedding, a community event, a party where guests are drawn from a broad population.
For a recurring office or corporate setting, that number tends to run higher. Guidance aimed at workplace catering commonly recommends closer to 30 to 50 percent of the menu being vegetarian-friendly, reflecting how skewed a single company’s population can be toward flexitarian and plant-based eating compared to the general public. If your event is a team lunch or an all-hands meeting rather than a public gathering, lean toward the higher end of that range rather than the general 20-25% floor.
Turning the Percentage Into an Actual Order
Percentages are only useful once you translate them into plate counts. For a buffet or family-style menu, apply the ratio to your total headcount and round up — caterers plan for slight overage on plant-based dishes specifically because they’re harder to substitute for on the fly than a straightforward protein reorder.
| Guest Count | General Event (20-25%) | Office / Corporate (30-50%) |
|---|---|---|
| 50 guests | 10-13 plant-based plates | 15-25 plant-based plates |
| 100 guests | 20-25 plant-based plates | 30-50 plant-based plates |
| 200 guests | 40-50 plant-based plates | 60-100 plant-based plates |
Two adjustments matter more than the raw math. Split the plant-based count across at least two distinct dishes rather than one large tray — a single vegetarian entrée that runs out mid-service leaves latecomers with nothing, while two smaller options let guests choose and reduce the odds of a total sellout. And treat vegan as its own category, not a subset automatically covered by "vegetarian" — a cheese-heavy vegetarian dish still excludes vegan guests entirely, so at least one option on the plant-based side should be dairy- and egg-free by design, not by substitution request.
A Better Number Than a Guideline: Ask Before You Guess
Percentage rules exist because hosts often don’t have better data — but when you can get better data, use it instead of the estimate. Building dietary questions into your RSVP process, ideally collected a few weeks ahead of the event, lets your caterer plan an exact count instead of a range. A simple RSVP form with checkboxes for vegetarian, vegan, and other common restrictions, plus an open field for anything else, is usually enough. Pass that information to your caterer in one organized list rather than a string of follow-up emails, and confirm the final numbers with them before the cutoff for menu changes in your contract.
If your guest list is genuinely unknowable — a public event, a fundraiser, an open house — the percentage guideline above is the right fallback. If it’s a defined list of employees, wedding invitees, or club members, a short RSVP question will almost always beat guessing, and it protects you from both the expensive over-order and the awkward under-order.
What "Vegetarian-Friendly" Actually Means on the Plate
Ordering the right quantity only solves half the problem — the dishes themselves need to hold up as real vegetarian or vegan food, not a plate with the protein removed. A few ingredients quietly break a dish’s vegetarian or vegan status without looking like it on a menu description: Worcestershire sauce and some stocks are made with anchovies or animal bones, gelatine shows up in desserts and some dressings, and animal rennet is used in a number of hard cheeses. When you’re reviewing a proposed menu with your caterer, it’s worth asking directly whether the vegetarian and vegan dishes were built from the ground up with those ingredients in mind, rather than assumed safe because nothing on the label says "meat."
The Bottom Line
Absent better information, plan for 20-25% of a general guest list wanting a plant-based dish, and closer to 30-50% for a corporate or office crowd. Split that share across at least two distinct dishes, make sure at least one is genuinely vegan rather than vegetarian-by-default, and check for the hidden animal ingredients that can undercut an otherwise well-planned vegetarian menu. Where you can collect real RSVP data instead of relying on a percentage, do it — a short dietary question on your invitation will always beat a rule of thumb, no matter how well-tested the rule of thumb is.